Energy minimization and ac demagnetization in a nanomagnet array

X. Ke, J. Li, C. Nisoli, Paul E. Lammert, W. McConville, R. F. Wang, V. H. Crespi, P. Schiffer

Research output: Contribution to journalArticlepeer-review


We study ac demagnetization in frustrated arrays of single-domain ferromagnetic islands, exhaustively resolving every (Ising-like) magnetic degree of freedom in the systems. Although the net moment of the arrays is brought near zero by a protocol with sufficiently small step size, the final magnetostatic energy of the demagnetized array continues to decrease for finer-stepped protocols and does not extrapolate to the ground-state energy. The resulting complex disordered magnetic state can be described by a maximum-entropy ensemble constrained to satisfy just nearest-neighbor correlations.

Original languageEnglish (US)
Article number037205
JournalPhysical review letters
Issue number3
StatePublished - Jul 17 2008
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy


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